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#include <mlibc/resolv_conf.hpp>
#include <mlibc/allocator.hpp>
#include <stdio.h>
#include <ctype.h>
namespace mlibc {
frg::optional<struct nameserver_data> get_nameserver() {
auto file = fopen("/etc/resolv.conf", "r");
if (!file)
return frg::null_opt;
char line[128];
struct nameserver_data ret;
while (fgets(line, 128, file)) {
char *pos;
if (!strchr(line, '\n') && !feof(file)) {
// skip truncated lines
for (int c = getc(file); c != '\n' && c != EOF; c = getc(file));
continue;
}
// TODO(geert): resolv.conf can actually have multiple nameservers
// but we just pick the first one for now
if (!strncmp(line, "nameserver", 10) && isspace(line[10])) {
char *end;
for (pos = line + 11; isspace(*pos); pos++);
for (end = pos; *end && !isspace(*end); end++);
*end = '\0';
ret.name = frg::string<MemoryAllocator>(
pos, end - pos, getAllocator());
break;
}
}
fclose(file);
if(ret.name.empty())
return frg::null_opt;
return ret;
}
} // namespace mlibc
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